if (!state) {
    return nullptr;
  }
  auto ops = state->getValue().ops;
  if (ops.size() != 1) {
    return nullptr;
  }
  Operation* source = *ops.begin();
  return source;
}

Attribute GetInitialValue(Operation* source) {
  if (auto global = dyn_cast<tf_saved_model::GlobalTensorOp>(source)) {
    if (global.getValue()) {
      return *global.getValue();
    }
  }
  return nullptr;
}

/// concerns.
//
// The Derived class should have a static method to return the initial value to
// use for reduction:
//   static Value GetInitialValue(Type reduce_element_type, Location loc,
//                                PatternRewriter *rewriter);
// The reduce_element_type is guaranteed to be a float, int, or complex type

                CountingService() {
                    value = parameters.initial.get()
                    println("service: created with value = \${value}")
                }

                synchronized int getInitialValue() { return parameters.initial.get() }

                // Service must be thread-safe
                synchronized void reset() {
                    value = parameters.initial.get()